The real decibel attenuation of the hearing protector in the workplace is lower than the value measured in the laboratory, because the measuring conditions in the laboratory are more strict.
研究表明：护耳器现场使用实际声衰减值低于实验室值，其原因是护耳器的实验室测量条件较为严格。
The real decibel attenuation of the hearing protector in the workplace is lower than the value measured in the laboratory, because the measuring conditions in the laboratory are more strict.
研究表明：护耳器现场使用实际声衰减值低于实验室值，其原因是护耳器的实验室测量条件较为严格。
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